<template>
  <div>
    <div class="search">
      <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音">
    </div>
    <div class="search-content" ref="search" v-show="keyword">
      <ul>
        <li class="search-item border-bottom" v-for="item of list" :key="item.id"
        @click="handleCityClick(item.name)"
        >{{item.name}}</li>
        <li class="search-item border-bottom" v-show="this.hasNoData">没有找到匹配数据</li>
        <!-- 意思是当List为0时才显示“没有找到匹配数据” -->
      </ul>
    </div>

  </div>

</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default{
  name:'CitySearch',
  props:{
    cities:Object
  },
  data () {
    return {
      keyword:'',
      list:[],
      timer:null
    }
  },
 methods:{
   handleCityClick (city) {
     this.changeCity(city)
     this.$router.push('/')
   },
   ...mapMutations(['changeCity'])
  },
  // 通过下面computed控制是否显示数据
  computed:{
    hasNoData () {
      return !this.list.length
    }
  },
  watch:{
    keyword () {
      if(this.timer){
        clearTimeout(this.timer)
      }
     // 下面控制有字才显示，取消后啥也没有
      if(!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() =>{
        const result = []
        for(let i in this.cities) {
          this.cities[i].forEach((value) => {
            if(value.spell.indexOf(this.keyword) > -1 ||
                value.name.indexOf(this.keyword) >-1) {
                  result.push(value)
                }
          })
        }
        this.list = result
      },100)
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.search)
  }

}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .search
      height :.72rem
      padding :0 .1rem
      background :$bgColor
      .search-input
        box-sizing :border-box
        padding :0 .1rem
        width :100%
        height :.62rem
        line-height :.62rem
        text-align center
        border-radius :.06rem
        color :#666
  .search-content
    overflow :hidden
    position :absolute
    top :1.58rem
    left :0
    right :0
    bottom :0
    background :#eee
    z-index :1
    .search-item
      line-height :.62rem
      padding-left :.2rem
      color :#666
      background :#fff

</style>
